diff --git a/docs/make.bat b/docs/make.bat
index 694e3859ffc0b2aaa3ab5598d41ce106cb101f29..ad9f4672639d1c016fe4b9df1d3b99d439c4bd39 100644
--- a/docs/make.bat
+++ b/docs/make.bat
@@ -22,6 +22,7 @@ if "%SPHINXBUILD%" == "" (
 set SOURCEDIR=.
 set BUILDDIR=_build
 set SPHINXPROJ=Gimmecert
+set SPHINXOPTS=-W
 
 if "%1" == "" goto help